Administration! New books every year... that never even get used (with kickbacks from the publishers probably). And of course a lot gets funneled back by teachers to the NEA and AFT and thus right back to the Democrat Party.
Blacks from the Caribbean republics come to America and do quite well. They are educated, have no chip on a racist shoulder, and are not devoted to twerking, cheap food and weed (with the exception of Jamaica which is the exception and should be excluded every which way, especially touristically).